 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.tasklist;

 import java.util.ArrayList ;
 import java.util.HashMap ;
 import java.util.Iterator ;
 import java.util.Map ;

 import org.eclipse.core.commands.operations.IUndoableOperation;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.ide.undo.UpdateMarkersOperation;

 class MarkCompletedAction extends TaskAction {

     /**
      * Create a MarkCompletedAction.
      * @param tasklist
      * @param id
      */
     protected MarkCompletedAction(TaskList tasklist, String id) {
         super(tasklist, id);
         PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
                 ITaskListHelpContextIds.MARK_COMPLETED_ACTION);
     }

     /**
      * Sets the completed value of the currently selected
      * actions.
      */
     public void run() {
         ISelection selectedMarkers = getTaskList().getSelection();
         if (selectedMarkers instanceof IStructuredSelection) {
             Iterator selections = ((IStructuredSelection) selectedMarkers).iterator();
             ArrayList markers = new ArrayList ();
             while (selections.hasNext()) {
                 Object marker = selections.next();
                 if (marker instanceof IMarker) {
                     markers.add(marker);
                 }
             }
             Map attrs = new HashMap ();
             attrs.put(IMarker.DONE, Boolean.TRUE);
             IUndoableOperation op = new UpdateMarkersOperation((IMarker [])markers.toArray(new IMarker [markers.size()]),
                     attrs, getText(), true);
             execute(op, getText(), null, null);

         }
         
     }

     /**
      * Returns whether this action should be enabled for the given selection.
      *
      * @param selection the selection
      * @return enablement
      */
     public boolean shouldEnable(IStructuredSelection selection) {
         if (selection.isEmpty()) {
             return false;
         }
         for (Iterator i = selection.iterator(); i.hasNext();) {
             IMarker marker = (IMarker) i.next();
             if (!(MarkerUtil.isMarkerType(marker, IMarker.TASK)
                     && !MarkerUtil.isComplete(marker) && MarkerUtil
                     .isEditable(marker))) {
                 return false;
             }
         }
         return true;
     }

 }

